| 摘要 |
1,167,052. Purification of aliphatic glycols. GLANZSTOFF A.G. 22 March, 1967 [16 April, 1966], No. 13433/67. Heading C2C. Purification of a glycol contaminated with oxidation products by adding water to the contaminated glycol in a quantity of 1 : 10 to 1 : 50 (water : glycol) by volume, distilling the mixture at 200-250 mm. of Hg until the water is substantially removed, and completing the distillation of the residue under reduced pressure of 10-100 mm. Hg, after addition of 0.2 to 0.3% by weight (based on the glycol introduced) of a pulverulent montmorillonite or hectorite activated with acid. The montmorillonite has the composition 50-75% SiO 2 , 10-23% A1 2 O 3 , 2-7% Fe 2 O 3 , 1-5% MgO, 0À5-4% CaO and 0À2-1À5% Na 2 O+K 2 O and the hectorite has the composition 50-75% SiO 2 , 0À3-1À5% Al 2 O 3 , 0À3-2À5% Fe 2 O 3 , 0À2-5À5% CaO and 10-30% MgO.
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